When a man really loves and cherishes a woman, he'll do almost anything to show and prove it to her on a daily basis. Buy her things or flowers. Take her to do things she likes and tell her that he loves her all the time.
The ones that you don't really love or want to love will get treated as such. You just ask them out occasionally and never make any type of commitment to. More like a part time friend rather than someone you wish to share your future with. Usually pretty easy to tell for men or women. You know in your heart whether this person is the one you wish to be with all the time and act accordingly .